Pension and Post-Retirement Benefit Costs (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
US Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 1	$ 0	$ 29
Interest cost	493	489	1,060	1,032
Expected return on plan assets	(658)	(705)	(1,460)	(1,524)
Amortization of net loss	337	318	640	609
Net periodic benefit cost	172	103	240	146
Non-US Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	137	414	462	835
Interest cost	582	525	1,149	1,061
Expected return on plan assets	0	0	0	0
Amortization of net loss	0	261	0	526
Net periodic benefit cost	719	1,200	1,611	2,422
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6	10	11
Interest cost	145	149	290	299
Amortization of net loss	32	96	63	192
Net periodic benefit cost	$ 182	$ 251	$ 363	$ 502